Quote:
Originally Posted by jhowell
It has been awhile since I looked into this, but I believe that the cover of the book must be a JPEG image with JFIF and not EXIF metadata for the Kindle lock screen cover feature to work.
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I confirmed that they are all .jpeg extensions. But I couldn't figure out how to check the metadata unfortunately...
Still, based on Kovid Goyal's next post, doesn't seem like that in itself would be the failure point. Thanks for the suggestion.